THE FORMATION CONDITIONS AND STABILITY OF CHAHANDUSI RESERVOIR LANDSLIDE IN XUNHUA COUNTY, QINGHAI PROVINCE
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摘要:
在开展循化县查汗都斯水库滑坡野外调查及工程地质调查的基础上, 简述了滑坡的发育特征、探讨了滑坡的形成条件, 进行了稳定性分析。研究表明, 地形地貌、地层岩性、地震活动及降水是该滑坡形成的主要因素。本文采用毕肖普法对该滑坡按天然状态和饱水状态两种工况进行稳定性计算, 采用ANSYS软件进行二维数值模拟分析, 所有结果均显示该滑坡目前处于基本稳定-稳定状态。建议对滑坡进行必要的监测或群测群防。
Abstract:Based on the field work and engineering geologic investigation of Chanhandusi Reservoir Landslide in Xunhua County, this paper focuses on the development characteristics, formation conditions and stability analysis of this landslide. The result shows that this landslide is mainly influenced by landforms, stratum lithology, earthquake and hydrology. ANSYS is used for the stability analysis, which suggests that Chahandusi Reservoir Landslide is currently under stable state. It is necessary for landslide monitoring.
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Key words:
- Chanhandusi reservoir landslide /
- formation conditions /
- stability analysis /
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表 1 滑体土及滑带土物理力学参数
Table 1. Physical and mechanical parameters of the landslide soil and slip soil
比重 孔隙比 天然含水量/% 干重度/(kN·m -3) 天然重度/(kN·m -3) 滑体土 2.71 0.78 11.90 15.2 17.1 滑带土 2.68 0.45 7.07 18.5 19.4 
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表 2 滑体土及滑带土物理学指标
Table 2. Physical indexes of the landslide soil and slip soil
内摩擦角φ/(°) 内聚力C/kPa 固结快剪 饱和固结快剪 固结快剪 饱和固结快剪 滑体土 29.0 28.0 8.5 7.0 滑带土 27.5 20.4 9.3 6.7
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表 3 自然状态(工况1)下稳定性计算结果
Table 3. Stability calculation result under natural state
滑面/FS Bishop Janbu Morgenstern-Price 稳定状态 1 1.277 1.125 1.220 稳定 2 6.042 5.443 5.818 稳定 3 4.784 4.182 4.777 稳定
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表 4 饱水状态(工况2) 下稳定性计算结果
Table 4. Stability calculation result under water saturated state
滑面/FS Bishop Janbu Morgenstern-Price 稳定状态 1 1.099 0.934 1.073 基本稳定 2 4.800 4.400 4.806 稳定 3 4.784 3.394 3.864 稳定
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